12．I don't know who invented _______ telephone，it's really _______ most useful invention．（　　）
A．the； aB．the； theC．a； aD．不填；不填

分析 我不知道誰發(fā)明了電話，它真是最有用的一項發(fā)明．

解答 答案：A
句中the telephone表示類指，要用定冠詞來限定；a most useful invention表示有用的一項發(fā)明，most表示程度，修飾useful，不是最高級；表示泛指一個，要用不定冠詞來限定．故選A．

點評 冠詞是一種虛詞，本身不能獨立使用，只能放在名詞前幫助說明名詞所指的人或事物，它是英語詞性中最小的一類，只有三個，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場合不用冠詞，即通常所稱的零冠詞．不定冠詞表示泛指，定冠詞表示特指．

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